Pressure, Level & Temperature Transmitters & Transducers
OPERATION/MAINTENANCE/HANDLING
The Model 311 is designed to give a 4-20 mA output directly proportional to pressure. Specific pressure
range, input voltage requirements and electrical connections are marked on unit. See Appendix A for all
performance specifications. Standard electrical connection is a HEYCO connector on the I.S. approved
p½” NPT M on Explosion Proof Series and pressure port is ¼” NPT(F). Appropriate mating con
nections are required for proper installation and safety. Other port and electrical connections are available
and noted as option code in part number. See Appendix A for list of options.
Replace broken fasteners (available through the factory) as they may compromise the seal and cause
contamination and/or electronics failure.
Unit can be hot when removed from service. Wear protective gloves when handling unit in this condition.
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TROUBLESHOOTING/RETURN INFORMATION
No output
-
Verify power supply voltage meets transmitter requirements
-
Check wiring connections
-
Verify pressure if being applied
-
Verify output load is not shorted
Erratic output or zero drift
-
Verify pressure applied is constant
-
Verify power supply remains within specifications
-
Inspect electrical connections for discontinuity or damage
-
Verify output with a multi-meter
-
Check insulation resistance between amplifier and transmitter case
Slow Response
- Verify pressure port is not clogged
If the problem persists, please call the factory as indicated below for assistance Have the following infor
mation ready:
-
Serial number
- Model number
- Loop setup – power supply, resistor, cable routing/length
- What action caused devices to fail?
Contact:
716-773-9300
Repairs should only be done by GP:50. Repairs done by customer will void any warranties and may
cause permanent damage to unit. Repairs done by customer on Intrinsically Safe units will void the
approvals and are a potential explosion hazard.
Returned products that have been exposed to hazardous substances should be cleaned prior to return
and should include the Material Safety Data Sheet for all substances.
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